Fuse-plug.



FUSE PLUG. .LPPLIGATIOI FILED I AY 22! 1913.

Pantpd Apr. 21, 1914.

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UNITED sTATiis PATENT onirica."

SEIZY'EERADA, 0F SEATTLE` WASHINGTON.

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Specification of Letters Patent. Patented ADI'. 21.. 1914.

Application led May 22, 1913. Serial No. 769,272.

To all whom it may concern Be it known-that I, SEizi TERADA, a subject of the Emperor of Japan, residing at Seattle, in .the county of; King and State of Tashingtom have invented certain new and useful Improvements in Fuse-Plugs, of

which the following is a specification. This invention relates to fuse-plugs.

i .The object is the improvement of devices of this character wherein the various members are constructed and assembled'to enable a new fuse to be conveniently substituted for one which has been burned out or blown 7 without rendering the plug proper unsuitable for `further use.

With these ends in view, the invention consists in the novel construction and combination 4of parts, as hereinafter described and claimed.

In the accompanying drawings, Figure 1 vis a side elevation of the improved fuseplug. F ig.- 2 isa longitudinal section of the same. Fig. 3 is aside elevation of-the fusible elenent container shown detached.

-The reference numeral 5of the drawings, designates the plug-body constructed of porcelain or other suitable insulating material.

if so cured from one end to the sleeve 9 and thence extends through an aperture l2 provided in the body and .has its other end 13 turned 4or bent to lie against the shoulder 8. Inserted within the recess 7 is a circular plate -14 which is secured in juxtaposition with the end 13 of the.abovementioned conductor and constitutes an extension thereof. Said plate is provided with a centrally disposed peephole 15 of less diameter than that of the chamber 6. Said. plate is secured by applying cement of an insulating character about the margin thereof, as indicated by 16 in Fig. 2.

17 represents the fusible element which inclosed Within a tube 18 of glass, porcelain or other suitable insulating material and may be attached to the tube by bending the ends 19. over the ends of thetube, as

shown in Fig. Q.

said tube are metal caps Q0 and 9.1 which serve as terminals for the fusible element.'

The cap 20 is provided .with a sight aperture 22 and is closed by a sheet of mica 23 interposed 'between the cap and the adjacent. end of the tube.

At 'the outer end of the body. is provided a sheet of mica Q4 which is held iii'place by a flanged collar member Q5. rl`he fuse-container is constituted of the tube 1S and caps 20 and 21, and is of such length that when the cap 20 is against the plate l1 the other cap, Q1, will protude from the inner end of the plug.

For operation, the container with an inclosed fuse is first introduced into the plug chamber 6, and` then the plug is screwed into the usual electric-light socket with the iesult that the cap Q1 and thesleeve 9 are brought into electrical connection with the 4contacts provided in the socket. The contacts being thus connected. the gap therebetween is closed or bridged through the medium of the cap Q1', the fusc17, cap 20, plate 14. conductor 11 and sleeve 9. When the fuse 17 is subjected to a current of greater amperage than the capacity of the fuse, the latter will be burnt out orv destroyed to renderit incapable of further use. Such destruction of tlie fuse instant-ly produces an extremely great heat which usu-l ally results in the breaking of the tube 18 and the mutilation of the sheet of mica 23. The mica sheet 24 is, however. safeguarded bymeans of the mica sheet 23 and the plate 14. After a fuse and its container have been rendered useless b v the burning of the Fitted over the ends of i fuse, the plug is withdrawn from the socket,

and a new container provided with a fuse is substituted for those previously used, and the plug is restored to the socket.

The costof the fuse and a container cons'tiucted in accordance with this invention 'is considerably less than the fusible plugs such as have hitherto been generally used. The plug proper may be repeatedly eniployed by replacing a ruined container and fuse by a new one, an operation which may be readily attained.

Vhat I claim is 1. A fuse-plug comprising a body p`i'o vided with a metal external sleeve contact, a

sheet of substantially transparent material extending across the. outer end of the plug, a

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tube of non-conductive` material inserted I, within the plug,metal ends for the' tube,- a 

